How to Fix Freezing Pipe Problems

Preventing Frozen Pipes with Proper Insulation

Frozen pipes cause burst pipes, water damage, and costly repairs. This guide shows you how to prevent freezing with proper insulation and what to do if pipes freeze.

❄️ Why Pipes Freeze

Water freezes at 0°C. When pipes are exposed to freezing temperatures, water inside expands and can burst the pipe.

High-risk locations:

• Lofts and attics
• Garages and outbuildings
• External walls
• Unheated basements
• Outdoor pipes

✅ Prevention: Proper Insulation

1. Insulate ALL Pipes in Unheated Spaces

Minimum thickness:

• Lofts/attics: 13mm minimum (19mm recommended)
• Garages/outbuildings: 13-19mm
• External walls: 13mm minimum
• Outdoor pipes: 19mm + protective cladding

Material: K-FLEX ST, SK, or PE insulation

2. Seal All Joints

Gaps at joints allow cold air to reach pipes. Seal all joints with adhesive or use self-seal tubes.

3. Insulate Valves & Fittings

Don't leave gaps at stop cocks, elbows, or tees. These are common freeze points.

4. Protect Outdoor Pipes

Outdoor pipes need extra protection:

• Use 19mm insulation minimum
• Protect with UV-resistant cladding or duct tape
• Consider heat trace cable for extreme cold
• Drain pipes if not in use during winter

🔧 Additional Freeze Protection

1. Maintain Heating

Keep heating on (minimum 10-15°C) in occupied buildings, even when away.

2. Open Loft Hatches

Allow warm air to circulate into loft spaces during cold snaps.

3. Drip Taps

During extreme cold, leave taps slightly open to keep water moving (prevents freezing).

4. Drain Unused Pipes

For seasonal properties or unused pipes:

• Turn off water supply
• Drain all pipes completely
• Open taps to release pressure

5. Heat Trace Cable

For pipes that can't be insulated adequately:

• Install electric heat trace cable
• Wrap around pipe before insulating
• Thermostatically controlled (activates below 3-5°C)

⚠️ What to Do If Pipes Freeze

Step 1: Turn Off Water Supply

Locate and turn off the main stop cock immediately.

Step 2: Open Taps

Open affected taps to relieve pressure as ice melts.

Step 3: Thaw Pipes Slowly

Safe methods:

• Use a hairdryer on low heat
• Wrap pipes in warm (not hot) towels
• Increase room temperature gradually
• Work from tap towards frozen section

Never use:

• ❌ Blowtorch or open flame
• ❌ Boiling water
• ❌ High heat (can burst pipes)

Step 4: Check for Leaks

Once thawed, check for:

• Cracks or splits in pipes
• Leaking joints
• Water damage

Step 5: Call a Plumber

If pipes have burst or you can't locate the freeze, call a professional plumber.

📊 Insulation Thickness for Freeze Protection

✅ Best Practices

• 📍 Insulate before winter — Don't wait for cold weather
• 📍 Use adequate thickness — 13mm minimum, 19mm for high-risk areas
• 📍 Seal all joints — Gaps allow cold air penetration
• 📍 Insulate fittings — Valves and elbows freeze first
• 📍 Protect outdoor pipes — Use cladding or heat trace
• 📍 Maintain heating — Keep minimum 10-15°C in winter

⚠️ Common Mistakes

• ❌ Insufficient thickness — 13mm is minimum, not ideal
• ❌ Leaving gaps at fittings — Valves freeze first
• ❌ No outdoor protection — UV degrades insulation
• ❌ Turning heating off — Pipes freeze when away
• ❌ Not draining seasonal pipes — Water freezes and bursts pipes

🛒 Shop Freeze Protection Insulation

• K-FLEX ST (Standard)
• K-FLEX SK (Self-Seal)
• K-FLEX PE (Domestic)
• 13 mm Insulation
• 19 mm Insulation

📚 Related Guides

• Insulation Thickness Selection Guide
• How to Choose Pipe Insulation
• How to Seal Joints
• Back to Knowledge Centre

Need freeze protection advice? Contact our technical team for help.